GPT-4 Turbo (older v1106) vs GPT-5.5 Instant
GPT-4 Turbo (older v1106) (2023) and GPT-5.5 Instant (2026) are compact production models from OpenAI. GPT-4 Turbo (older v1106) ships a 128k-token context window, while GPT-5.5 Instant ships a 400k-token context window. On pricing, GPT-5.5 Instant costs $5/1M input tokens versus $10/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
GPT-5.5 Instant is ~100% cheaper at $5/1M; pay for GPT-4 Turbo (older v1106) only for provider fit.
Decision scorecard
Local evidence first| Signal | GPT-4 Turbo (older v1106) | GPT-5.5 Instant |
|---|---|---|
| Best for | general production evaluation | multimodal apps and tool-calling agents |
| Decision fit | RAG, Long context, and Classification | Coding, RAG, and Agents |
| Context window | 128k | 400k |
| Cheapest output | $30/1M tokens | $30/1M tokens |
| Provider routes | 1 tracked | 1 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Local decision data tags GPT-4 Turbo (older v1106) for RAG, Long context, and Classification.
- GPT-5.5 Instant has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5.5 Instant uniquely exposes Vision, Multimodal, and Function calling in local model data.
- Local decision data tags GPT-5.5 Instant for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
GPT-4 Turbo (older v1106)
$15,500
Cheapest tracked route/tier: OpenRouter
GPT-5.5 Instant
$11,500
Cheapest tracked route/tier: OpenAI API
Estimated monthly gap: $4,000. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for GPT-4 Turbo (older v1106) and GPT-5.5 Instant; plan for SDK, billing, or endpoint changes.
- Cheapest tracked output pricing is tied, so migration risk shifts to quality, latency, and provider packaging.
- GPT-5.5 Instant adds Vision, Multimodal, and Function calling in local capability data.
- No overlapping tracked provider route is sourced for GPT-5.5 Instant and GPT-4 Turbo (older v1106); plan for SDK, billing, or endpoint changes.
- Cheapest tracked output pricing is tied, so migration risk shifts to quality, latency, and provider packaging.
- Check replacement coverage for Vision, Multimodal, and Function calling before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2023-11-06 | 2026-05-05 |
| Context window | 128k | 400k |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2023-04 | 2025-08 |
Pricing and availability
| Pricing attribute | GPT-4 Turbo (older v1106) | GPT-5.5 Instant |
|---|---|---|
| Input price | $10/1M tokens | $5/1M tokens |
| Output price | $30/1M tokens | $30/1M tokens |
| Providers |
Capabilities
| Capability | GPT-4 Turbo (older v1106) | GPT-5.5 Instant |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | No | No |
| Function calling | No | Yes |
| Tool use | No | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on vision: GPT-5.5 Instant, multimodal input: GPT-5.5 Instant, function calling: GPT-5.5 Instant, tool use: GPT-5.5 Instant, and code execution: GPT-5.5 Instant. Both models share structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, GPT-4 Turbo (older v1106) lists $10/1M input and $30/1M output tokens on the cheapest tracked provider, while GPT-5.5 Instant lists $5/1M input and $30/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts GPT-5.5 Instant lower by about $3.50 per million blended tokens. Availability is 1 providers versus 1, so concentration risk also matters.
Choose GPT-4 Turbo (older v1106) when provider fit are central to the workload. Choose GPT-5.5 Instant when coding workflow support, larger context windows, and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions.
FAQ
Which has a larger context window, GPT-4 Turbo (older v1106) or GPT-5.5 Instant?
GPT-5.5 Instant supports 400k tokens, while GPT-4 Turbo (older v1106) supports 128k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, GPT-4 Turbo (older v1106) or GPT-5.5 Instant?
GPT-5.5 Instant is cheaper on tracked token pricing. GPT-4 Turbo (older v1106) costs $10/1M input and $30/1M output tokens. GPT-5.5 Instant costs $5/1M input and $30/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is GPT-4 Turbo (older v1106) or GPT-5.5 Instant open source?
GPT-4 Turbo (older v1106) is listed under Proprietary. GPT-5.5 Instant is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, GPT-4 Turbo (older v1106) or GPT-5.5 Instant?
GPT-5.5 Instant has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for multimodal input, GPT-4 Turbo (older v1106) or GPT-5.5 Instant?
GPT-5.5 Instant has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run GPT-4 Turbo (older v1106) and GPT-5.5 Instant?
GPT-4 Turbo (older v1106) is available on OpenRouter. GPT-5.5 Instant is available on OpenAI API. Provider coverage can affect latency, region availability, compliance posture, and fallback options. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Continue comparing
Last reviewed: 2026-05-19. Data sourced from public model cards and provider documentation.